Located in Australia.
Say I want to be the #1 peanut butter producer.
Being a common person, with a common wage I cannot create or start my own production facility.
I find a peanut butter in store which has the fundamentals of what I need (viscosity, salt levels, other nutritional values) The brand is 'PB-X.
If I buy a crate of PB-X and then apply my own modification - Say add in almonds.
Are you now legally allowed to rebrand this product as your own?